Seasonal diet shifts of seven fish species in an Atlantic rainforest stream in Southeastern Brazil
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Data
2003-11-01
Autores
Deus, C. P.
Petrere-Junior, M. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Instituto Internacional de Ecologia
Resumo
Nós analisamos o conteúdo estomacal de 116 indivíduos pertencentes a sete espécies de peixes, no intuito de investigar as mudanças sazonais na estratégia alimentar e como interações tróficas entre as espécies afetam a estrutura de comunidade em um riacho de Mata Atlântica no Sudeste do Brasil. Oligosarcus hepsetus e Pimelodus sp. consumiram menos itens durante o inverno. Phalloceros caudimaculatus mudou o hábito alimentar de detrito durante o verão para algas durante o período de inverno. Esses exemplos são relacionados às variações na disponibilidade de alimento e na seletividade alimentar das espécies. Os mais altos valores de sobreposição alimentar, para a maioria das espécies, medidos pelo índice de Schoener, foram observados no verão, quando as espécies tenderam a ser mais generalistas. A variação no padrão alimentar pode influenciar a estrutura das comunidades de peixes.
We analyzed the stomach contents of 116 individuals belonging to seven fishes species in order to investigate seasonal changes in feeding strategy and how trophic interactions between species affect community structure in an Atlantic rainforest stream in Southeastern Brazil. Oligosarcus hepsetus and Pimelodus sp. consumed fewer items during the winter. Phalloceros caudimaculatus switched feeding habits from detritus during summer to algae during winter. These examples are related to variations in food availability and species feeding selectivity. The highest diet overlap values, for most species, as measured using Schoener's index, were observed in summer, along with a species tendency to be more generalist. Feeding pattern variation may influence the fish community structure.
We analyzed the stomach contents of 116 individuals belonging to seven fishes species in order to investigate seasonal changes in feeding strategy and how trophic interactions between species affect community structure in an Atlantic rainforest stream in Southeastern Brazil. Oligosarcus hepsetus and Pimelodus sp. consumed fewer items during the winter. Phalloceros caudimaculatus switched feeding habits from detritus during summer to algae during winter. These examples are related to variations in food availability and species feeding selectivity. The highest diet overlap values, for most species, as measured using Schoener's index, were observed in summer, along with a species tendency to be more generalist. Feeding pattern variation may influence the fish community structure.
Descrição
Palavras-chave
Mata Atlântica, sobreposição de dieta, variabilidade alimentar, especialista, generalista, Atlantic rainforest, diet overlap, feeding variability, specialist, generalist
Como citar
Brazilian Journal of Biology. Instituto Internacional de Ecologia, v. 63, n. 4, p. 579-588, 2003.